How do you hook up a tachometer to a 1990 BMW 325i?

Answer 1

I guess the big question is.. are you hooking up a new tach in existing place of old one or aftermarket.... either way your best bet if you wanna go cheap and don't want to pay mechanic costs.. go to your local autozone and purchase a Hannes manual for your make and year of car... it has very detailed wiring diagram in the back of it for every part on your vehicle.... I actually have a 98 BMW 328is Dinan package and purchased a 5 in monster tach just this past monday.... had my tach hooked up and running and installed in a matter of about an hour but that includes running wires.....but for someone to answer your question they really cant unless they have exact same year and make of your car....but as far as the wiring goes obviously the RED=power WHITE=your illumination BLACK=Ground and GREEN=either to yoru negative side of your distributor or if your brave hook into your existing OEM tach in back of your instrument cluster.... hope this helps